package opera;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOPeration{
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书");
        System.out.println("请输入你要删除的书名：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int currentSize = bookList.getUsedSize();
        int index = -1;
        for (int i = 0; i < currentSize; i++) {
            Book tmp = bookList.getBook(i);
            if (tmp.getName().equals(name)) {
               index = i;
               break;
            }
        }
        //挪动数据
        for (int j = index ;j < currentSize-1 ; j++){
            Book book = bookList.getBook(j+1);
            bookList.setBooks(j,book);

        }
        bookList.setUsedSize(currentSize - 1);//删除图书所以usedSize减一
        bookList.setBooks(currentSize-1,null);//因为删除的是对象，所以最后一个变为null
    }
}
